from flask import render_template, current_app, g, jsonify, abort, request
from application import constants, db
from application.models import News, Comment, CommentLike, User
from application.utils.common import user_login_data
from application.utils.response_code import RET
from . import news_blue

@news_blue.route("/followed_user", methods=["POST"])
@user_login_data
def followed_user():
    """
    关注和取消关注用户
    :return:
    """
    # 取到自己的登录信息
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="未登录")

    # 获取参数
    user_id = request.json.get("user_id")
    action = request.json.get("action")

    # 判断参数
    if not all([user_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    if action not in("follow", "unfollow"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    # 取到要被关注的用户
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not other:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")

    # 根据要执行的操作取修改对应的数据
    if action == "follow":
        if other not in user.followed:
            # 当前用户的关注列表添加一个值
            user.followed.append(other)
            # other.followers.append(user

    else:
        # 取消关注
        if other in user.followed:
            user.followed.remove(other)

    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blue.route("/comment_like", methods=['POST'])
@user_login_data
def comment_like():
    """
    点赞功能
        1.获取参数
        2.校验参数

    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登陆")

    # 1.获取参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 2.校验参数
    if not all([comment_id, news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    # 判断点赞状态是否正常
    if action not in ("add", "remove"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    # 3.查询当前用户是否点赞该评论
    try:
        comment = Comment.query.get(comment_id)  # 用户评论的编号
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库查询错误")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论数据不存在")

    if action == "add":
        # 点赞
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()

        # 判断该评论是否有点赞
        if not comment_like_model:
            comment_like_model = CommentLike()
            comment_like_model.comment_id = comment_id
            comment_like_model.user_id = user.id

            try:
                db.session.add(comment_like_model)
                db.session.commit()
                comment.like_count += 1
            except Exception as e:
                db.session.rollback()
                current_app.logger.error(e)
                return jsonify(errno=RET.DBERR, errmsg="点赞失败")
    else:
        # 取消点赞
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="操作失败")
    return jsonify(errno=RET.OK, errmsg="点赞成功")


@news_blue.route("/news_comment", methods=['POST'])
@user_login_data
def news_comment():
    """
    评论新闻或者回复某条新闻下指定评论
        1.获取参数
        2.校验参数

    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登陆")
    # 1.获取参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    # 2.校验参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    # 查询新闻,并判断新闻是否存在
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.NODATA, errmsg="参数有误")

    if not news:
        return jsonify(errno=RET.DBERR, errmsg="未查询到该新闻数据")

    # 3.初始化评论模型
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content

    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    # 在返回之前需要使用comment的信息,例如评论的用户,头像等,所以不能使用默认的提交
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger(e)
        return jsonify(errno=RET.PARAMERR, errmsg="数据提交失败")
    return jsonify(errno=RET.OK, errmsg="评论成功", data=comment.to_dict())


@news_blue.route("/news_collect", methods=['POST'])
@user_login_data
def collect_news():
    """
    收藏新闻
        1.获取参数
        2.校验参数
        3.查询新闻,并判断新闻是否存在
        4.收藏
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登陆")

    # 1.获取参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 2.校验参数
    if not ([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    if action not in ["collect", "cancel_collect"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数有误")

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="未查询到新闻数据")

    # 3.查询新闻,并判断新闻是否存在
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.NODATA, errmsg="参数有误")

    if not news:
        return jsonify(errno=RET.DBERR, errmsg="未查询到该新闻数据")

    if action == "cancel_collect":
        # 取消收藏
        if news in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.remove(news)
    else:
        # 4.收藏
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)

    return jsonify(errno=RET.OK, errmsg="收藏成功")


@news_blue.route('/<int:news_id>')
@user_login_data
def news_blue(news_id):
    """
    新闻详情
    :param news_id:
    :return:
    """
    # 显示用户登录逻辑
    user = g.user

    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    news_dict_li = []

    # 遍历对象列表,将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")
    if not news:
        abort(404)

    # 更新新闻点击次数
    news.clicks += 1

    is_collected = False

    if user:
        # 判断用户是否收藏当前新闻,如果收藏
        if news in user.collection_news:
            is_collected = True

    # 查询评论数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="评论查询失败")

    comment_like_ids = []
    if user:
        # 查询当前用户在当前新闻里面都点赞了哪些评论
        # 1.查询出当前新闻所有评论(comment)
        comment_ids = [comment.id for comment in comments]

        # 2.查询当前评论中哪些评论被当前用户点赞(commentlike)
        try:
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids), CommentLike.user_id == user.id).all()
        except Exception as e:
            current_app.logger.error(e)
            return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

        # 3.取到所有被点赞的评论id
        comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]

    comment_dict_li = []

    for comment in comments:
        comment_dict = comment.to_dict()

        # 判断是否点赞
        # 代表没有点赞
        comment_dict['is_like'] = False

        if comment.id in comment_like_ids:
            comment_dict['is_like'] = True

        comment_dict_li.append(comment_dict)

    # 是否关注
    is_followed = False
    # if 当前新闻有作者, 并且 当前登录用户已关注过这个用户
    if news.user and user:
        # if user 是否关注过 news.user
        if  news.user in user.followed:
            is_followed = True
    data = {
        "news_dict_li": news_dict_li,
        "user": user.to_dict() if user else None,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments": comment_dict_li,
        "is_followed" : is_followed

    }
    return render_template("news/detail.html", data=data)


